A cylinder stretch forming device

Abstract

The utility model discloses a cylinder stretch forming device belongs to the punch forming field, this cylinder stretch forming device, including punch device, the inside installation of punch device lower mould has the impact seat, the middle position of impact seat top is equipped with the mounting groove, the inside installation of mounting groove has electromagnet, frequency converter and circuit protection device, the top of impact seat is equipped with the sliding slot, the inside installation of sliding slot has the slide rod, the surface sliding installation of slide rod has the sliding block. The utility model is through the combination of electromagnet and movable top block, with the frequency of alternating current, when carrying out the punch action, and top block can satisfy the processing size realization to the part processing, when the punch action ends, because of the access of alternating current, makes electromagnet attract top block to move, makes top block and the inside of part to separate, thereby convenient to the ejection of part.

Description

Technical Field

[0001] This utility model belongs to the field of stamping forming technology, specifically relating to a cylindrical stretching forming device. Background Technology

[0002] Cylindrical stretch forming is a metal stamping process primarily used to process flat metal blanks into open hollow cylindrical parts using molds. It is widely used in the automotive, pressure vessel, fire extinguisher, and hardware industries. A punch presses a sheet metal into a concave mold cavity, causing plastic deformation to form a bottomed hollow cylinder. This process typically involves one or more stretching operations to achieve the desired depth and shape.

[0003] During the demolding process of stamping dies, common problems mainly focus on workpiece jamming, deformation, surface damage, and die wear.

[0004] Due to the large elastic deformation of the material, the workpiece "clamps" to the punch. Or, air pressure / vacuum adsorption: negative pressure is formed in the enclosed space, and the workpiece is "sucked" in. Or, poor lubrication: the coefficient of friction is high, and the workpiece adheres to the mold surface, etc., which prevents the workpiece from being smoothly removed from the punch or die, and may even require manual prying. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a cylindrical stretching and forming device.

[0006] The technical solution adopted to solve the above technical problems is: a cylindrical stretching and forming device, including a stamping device, an impact seat is installed inside the lower die of the stamping device, an installation groove is opened at the middle position of the top of the impact seat, an electromagnet, a frequency converter and a circuit protection device are installed inside the installation groove, a sliding groove is opened at the top of the impact seat, a sliding rod is installed inside the sliding groove, a slider is slidably installed on the surface of the sliding rod, a spring is sleeved on the outer surface of the sliding rod, a top block is integrally formed on the top of the slider, and a magnetic sheet is installed on the bottom side of the top block.

[0007] Furthermore, the number of the grooves is four, and they are symmetrically distributed on the top of the impact seat.

[0008] Furthermore, the spring is mounted on the slide rod at a position between the slider and the inner wall of the slide groove.

[0009] Furthermore, the top block is in the shape of a quarter cylinder, and a groove adapted to an electromagnet is provided on the side of the top block at the position where the magnetic sheet is installed.

[0010] Furthermore, the impact seat has a through hole inside which an electrical wire is installed.

[0011] Furthermore, the electromagnet is electrically connected to the frequency converter and the circuit protection device.

[0012] The beneficial effects of this utility model are as follows: This utility model adopts a combination of electromagnet and movable top block. With the help of the frequency of alternating current, the top block can meet the processing dimensions to process the parts during the stamping action. After the stamping action is completed, due to the connection of alternating current, the electromagnet attracts the top block to move, so that the top block is separated from the inside of the part, thereby facilitating the demolding of the part. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the present invention; Figure 2 This is a front view of the structure of this utility model; Figure 3 This is a cross-sectional view of the internal structure of the impact seat of this utility model.

[0014] Reference numerals: 1. Stamping device; 2. Impact seat; 3. Mounting groove; 4. Electromagnet; 5. Frequency converter; 6. Circuit protection device; 7. Slide groove; 8. Slide rod; 9. Slider; 10. Spring; 11. Top block; 12. Magnetic sheet. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] like Figures 1 to 3 As shown in this embodiment, a cylindrical stretching forming device has an impact seat 2 fixedly installed inside the lower die of the stamping device 1. The impact seat 2 is a rectangular steel block with a mounting groove 3 machined at the center of its top surface to ensure suitable installation space for the internal components. An electromagnet 4, a frequency converter 5, and a circuit protection device 6 are installed in the mounting groove 3, and the three are connected to the threaded hole at the bottom of the groove by M4 screws. After stamping, the magnetic field generated by the electromagnet 4 can interact with the magnetic sheet 12, thereby driving the slider 9. Its advantage is that the response speed is fast, and the magnetic field can be generated or eliminated instantly, so that the movement of the slider 9 can be carried out quickly and accurately. The frequency converter 5 can adjust the current frequency according to actual needs, thereby changing the working state of components such as the electromagnet 4. After the stamping action is completed, the electromagnet 4 is charged. When the stamping action is performed, the charging of the electromagnet 4 is stopped. The circuit protection device 6 can monitor the current, voltage and other parameters in the circuit in real time. When an abnormal situation occurs, it will quickly cut off the circuit to protect the electromagnet 4, frequency converter 5 and other components from damage.

[0017] A groove 7 is machined at each of the four corners of the top surface of the impact seat 2. The groove 7 has a rectangular cross-section, and the distance between the center line of symmetry and the edge of the impact seat 2 is 15mm. A slide rod 8 is pressed into each groove 7. The two ends of the slide rod 8 are fixed to the end face of the groove 7 by M6 set screws. A slider 9 is fitted onto the slide rod 8. The slider 9 is a rectangular copper alloy part with a clearance fit of 0.05mm with the slide rod 8. A spring 10 is fitted on the outer diameter of the slide rod 8. The spring 10 is a compression spring. After installation, one end abuts against the side of the slider 9, and the other end abuts against the inner wall of the groove 7, with a pre-compression of 5mm.

[0018] The top surface of slider 9 is integrally machined with a top block 11, which is a quarter-cylinder. Combined with the number of grooves 7, four top blocks 11 can form a complete cylinder to meet the machining requirements of the cylindrical body. The bottom surface is the same width as the top surface of slider 9. A 2mm × 2mm chamfer is machined on the outer side of the bottom surface of top block 11. A groove is machined on the bottom side of top block 11, and a magnetic sheet 12 is glued and fixed inside the groove. The magnetic sheet 12 is neodymium iron boron (N35) with a surface magnetic field strength of 0.35T. The center of the groove is aligned with the center of electromagnet 4. A φ6mm through hole is drilled inside the impact seat 2 along its long axis. A polytetrafluoroethylene insulating sleeve is installed inside the hole, and a 0.75mm² high-temperature resistant wire is laid inside the sleeve. The wire connects to the electromagnet 4, the frequency converter 5, and the circuit protection device 6, thereby connecting to the power supply for power supply. The rated voltage of the electromagnet 4 is 24VDC, which is powered by the output terminal of the frequency converter 5. The input terminal of the frequency converter 5 is connected to 220VAC 50Hz. The circuit protection device 6 is a combination of a 2A fast-blow fuse and a varistor. The nominal voltage of the varistor is 470V.

[0019] The working principle of this embodiment is as follows: When the stamping device 1 starts working, the frequency of the current is first adjusted by the frequency converter 5 to match the stamping processing rhythm. After the stamping is completed, the electromagnet 4 is energized, and the electromagnet 4 quickly generates magnetic force. Since the magnetic plate 12 on the top block 11 is compatible with the electromagnet 4, the magnetic plate 12 will be attracted by the magnetic field force, thereby driving the top block 11 and the slider 9 to slide on the slide rod 8. The sliding of the slider 9 will compress the spring 10, so that the top block 11 will no longer contact the side of the part, thus facilitating the rapid demolding of the formed part. Therefore, when the stamping action is performed, since the alternating current is applied, there is no current at this time, and the power supply to the electromagnet 4 is cut off. The magnetic field disappears, and the restoring force of the spring 10 will cause the slider 9 to return to the initial position. At this time, the top block 11 will move to the initial position to cooperate in realizing the stamping action.

[0020] Throughout the entire operation, the circuit protection device 6 monitors the circuit status in real time. If excessive current or abnormal voltage occurs, the circuit protection device 6 will quickly cut off the circuit, protecting components such as the electromagnet 4 and the frequency converter 5 from damage and ensuring the stable operation of the electromagnet 4. The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model.

Claims

1. A cylindrical stretching and forming apparatus, comprising a stamping device (1), characterized in that: The stamping device (1) has an impact seat (2) installed inside the lower die. The impact seat (2) has an installation groove (3) at the top center. The installation groove (3) has an electromagnet (4), a frequency converter (5) and a circuit protection device (6) installed inside. The impact seat (2) has a sliding groove (7) at the top. The sliding groove (7) has a sliding rod (8) installed inside. The sliding rod (8) has a slider (9) slidably installed on its surface. The sliding rod (8) has a spring (10) sleeved on its outer surface. The top of the slider (9) has a top block (11) integrally formed. The bottom side of the top block (11) has a magnetic sheet (12) installed.

2. The cylindrical stretching and forming device according to claim 1, characterized in that: The number of the grooves (7) is four and they are symmetrically distributed on the top of the impact seat (2).

3. The cylindrical stretching and forming device according to claim 1, characterized in that: The spring (10) is mounted on the slide bar (8) between the slider (9) and the inner wall of the groove (7).

4. The cylindrical stretching and forming device according to claim 1, characterized in that: The top block (11) is in the shape of a quarter cylinder, and a groove adapted to an electromagnet (4) is provided on the side of the top block (11) at the position where the magnetic sheet (12) is installed.

5. The cylindrical stretching and forming device according to claim 1, characterized in that: The impact seat (2) has a through hole inside which an electrical wire is installed.

6. The cylindrical stretching and forming device according to claim 1, characterized in that: The electromagnet (4) is electrically connected to the frequency converter (5) and the circuit protection device (6).

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